rolling track

例句：

1. 1. The train is traveling ona rolling track.
   火车正在沿着一条滚动轨道行驶。
2. 2. The car was moving along arolling track.
   汽车正沿着一条滚动轨道行驶。
3. 3. The ball rolled down the rolling track.
   球沿着一条滚动轨道滚了下来。